Pollutionwatch: why cleaning the air is like taking milk out of tea
by Gary Fuller from on (#45EDJ)
Scrubbing up the skies is hard - however many filter towers and houseplants are on the job
Among the high-rise apartment blocks of Xi'an, China, there is a 100-metre cylindrical tower. It looks like a chimney, but it has a very different purpose. It is trying to filter the city's air. Smaller examples of outdoor air filters have been erected in the Netherlands and Poland, and filters have been installed next to roads in Delhi and on buses in Southampton. Other ideas include plants and surfaces that react with the pollution, but cleaning outdoor air is difficult since the pollution is already diluted. It's like trying to take the milk out of your tea.
Related: What would a smog-free city look like?
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